# -*- coding: utf-8 -*-
"""
Created on Fri Nov 18 11:23:07 2022

@author: YSL
"""

words=str(input("请输入一段字符串："))
a=len(words)
for i in range(a):
    tip=0
    for j in range(i+1,a):
        if words[i]==words[j]:
            tip=1
            break
    for k in range(i):
        if words[i]==words[k]:
            tip=1
            break
    if tip==0:
        print("True")
        break
if tip==1:
    print("Flase")
        